Note: Voltage and intensity dependence of the saturation curves of free-air ionization chambers irradiated with chopped synchrotron radiation beams

2012 ◽  
Vol 83 (1) ◽  
pp. 016104 ◽  
Author(s):  
Nobuteru Nariyama
Keyword(s):  
Synchrotron Radiation ◽  
Ionization Chambers ◽  
Intensity Dependence ◽  
Free Air ◽  
Air Ionization ◽  
Radiation Beams

scholarly journals Current saturation in free-air ionization chambers with chopped synchrotron radiation

2013 ◽  
Vol 20 (5) ◽  
pp. 698-704 ◽  
Author(s):  
Nobuteru Nariyama
Keyword(s):  
Synchrotron Radiation ◽  
Electric Field ◽  
Rotating Disk ◽  
X Rays ◽  
Electrode Gap ◽  
Ionization Chambers ◽  
Free Air ◽  
Air Ionization ◽  
Before And After ◽  
Ion Recombination

Saturation curves for free-air ionization chambers with electrode gap widths of 4.2, 8.4 and 18 mm were obtained for 10 and 15 keV undulator synchrotron radiation thinned with a 230 Hz rotating-disk chopper. Ion recombination in free-air ionization chambers was found to be inversely proportional to the applied electric field, and an expression that satisfactorily reproduced the ion-recombination rate is determined. A comparison of the expressions for continuous and pulsed X-rays revealed that chopped high-intensity X-rays require a higher voltage to attain saturation when the product of the pulse width and electric field exceeds a value that depends on the X-ray energy. This behaviour was observed explicitly for 10 keV X-rays in measurements with the ionization chamber placed before and after the chopper.

Free-air ionization chambers

Metrologia ◽  
2009 ◽  
Vol 46 (2) ◽  
pp. S9-S23 ◽  
Author(s):  
D T Burns ◽  
L Büermann
Keyword(s):  
Ionization Chambers ◽  
Free Air ◽  
Air Ionization

SU-CC-ValA-07: Air Kerma Rate Measurements From a Miniature X-Ray Source Using Free-Air Ionization Chambers

2006 ◽  
Vol 33 (6Part2) ◽  
pp. 1983-1984
Author(s):  
S Davis ◽  
J Micka ◽  
L DeWerd ◽  
T Rusch
Keyword(s):  
Ionization Chambers ◽  
X Ray ◽  
Air Kerma ◽  
Free Air ◽  
Air Ionization ◽  
Air Kerma Rate

Plate Separation Requirements for Standard Free-Air Ionization Chambers

Radiology ◽  
1954 ◽  
Vol 63 (6) ◽  
pp. 853-866 ◽  
Author(s):  
Frank H. Attix ◽  
LeRoy DeLaVergne
Keyword(s):  
Ionization Chambers ◽  
Free Air ◽  
Air Ionization ◽  
Plate Separation

Beam-loss monitoring system with free-air ionization chambers

1980 ◽  
Vol 174 (3) ◽  
pp. 401-409 ◽  
Author(s):  
H. Nakagawa ◽  
S. Shibata ◽  
S. Hiramatsu ◽  
K. Uchino ◽  
T. Takashima
Keyword(s):  
Monitoring System ◽  
Ionization Chambers ◽  
Beam Loss ◽  
Free Air ◽  
Air Ionization
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